Trimming mechanism for sewing-machines.



L. ONDERDONK.

TRIMMING MECHANISMFOR SEWING MACHINES.

APPLICATION FILED MAR. 31, I913- Patented May 8, 1917.

1 3 SHEETSSHEET I.

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TRIMMING MECHANISM FOR SEWING MACHINES.

APPLICATION F|LED MAR 31. 1913.

1325,1650 Patented MayS, 1917.

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TRlMMING MECHAIHSM FOR SEWING MACHINES.

APPLICATION FILED MAR. 31, I913.

3 SHEETSSHEET 3.

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UNTTED STATES PATENT @FFTCE.

LANSING ONDEEDONK, OF NEW YORK, 1., ASSIGNOR T6 THE UNION SPECIAL IMACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TRIMMING MECHANISM: FOR. SEWING-T/IAGIIINES.

To all whom it may concern:

Be it known that I, LANSING ()NDERDONK, a citizen of the United States, residing at 65 Bleecker street, New York, in the count-y of New York, State of New York, have invented certain new and useful Improvements in Trimming Mechanisms for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in sewing machines, and more particularly to the trimming mechanism of a sewing machine.

An object of the invention is to provide a trimming mechanism wherein the trimming blades, in addition to the trimming movements partake of the up and down movements of the presser foot, due to varying thicknesses of material underneath the presser foot, whereby an upper ply of fabric passing over the front portion of the presser foot, or a folded over edge of fabric may be trimmed.

A further object of the invention is to provide an operating mechanism for a trimming mechanism of the above characterwhich is so constructed and arranged that the presser foot may be raised from the work support for the insertion of the material without substantially altering the relative position of the trimming members.

These and other objects will in part be obvious and will in part be hereinafter more fully described.

In the drawings, which show by way of illustration one embodiment of the invention,

Figure 1 is a rear view of a sewing machine embodying my improvement, certain parts thereof being sectioned;

Fig. 2 is a front end view of the same, certain parts being omitted, and certain parts being broken away for the sake of clearness;

Fig. 3 is a top plan view partly in section, showing the trimming members, the

Specification of Letters Patent.

Patented May 8, illiil'i.

Application filed March 31, 1913. Serial No. 757,944.

support therefor, and the operating mechanism for the trimming members.

Fig. 4 is a detail in perspective, showing the trimming members and their relation to the presser foot and upper feed dog;

Fig. 5 is a transverse sectional View through the presser foot and the trimming members;

Fig. 6 is an enlarged perspective view of the presser foot.

The sewing machine to which my invention is applied consists generally of a supporting bed 1, carrying a standard 2, having an overhanging arm 3. At the forward end of the overhanging arm are suitable bearings in which reciprocates a needle bar t carrying a needle 5. This needle bar is reciprocated in the usual way. A presser bar 6 is also mounted to move vertically and carries a presser foot 7 at the lower end. A leaf spring 8 bears on a projecting, lug carried by the presser bar 6, and yieldingly holds the presser foot on the work support. The presser bar is raised to permit the insertion of the material by a lever 9, which may be connected to a treadle or knee shift. A hand lever 10 may also be used for raising the presser bar.

The presser foot, as herein shown, is provided with a folder 11. Said presser foot is slotted as at 12 to permit an edge of fabric to be led up through said slot and turned over by said folder 11. A tongue 13 is fixed .to the presser foot and serves as a means over which the fabric may be folded. Said folder is slotted as at 14, and an upper feed dog 15 is provided with a feeding portion 16, which projects through said slot-and engages the folded-over edge resting on the rigid tongue 13, and feeds said edge through the folder. The presser foot is recessed on its upper face to provide a space for the folder and permit the folding over of the edge of fabric. This particular form of presser foot and feeding mechanism, and also the general arrangement of the trim mer relative to the folder to be hereinafter described, form no part of the present invention, but are shown, described and claimed in my co-pending application, Serial No. 757,945, filed of even date herewith.

The trimming mechanism comprises a lower fixed member 17 and an upper movable member 18. The upper face of the presser foot, as herein shown, is recessed, and this lower member ,17 engages said recess and is secured therein by suitable screws 19. The upper member 18 is pivoted on a stud 20, which is carried by the shank of the presser foot and is held therein by a set screw 21. Said shank is formed with a socket 22 at its face adjacent the trimmer and a spring 23 located in said socket engages the movable trimmer and yieldingly presses the same into contact with the fixed member 17. While I have referred to the member 17 as a fixed member, it will be noted, of course, that this member is carried by the presser foot and moves up and down therewith. So far as the trimming movements of the trimming members is concerned, it is fixed.

These trimming members are so disposed as to engage the folded-over edge of fabric in advance of the folder. It will be obvious, however, that from certain aspects of the invention, this trimming mechanism may be otherwise arranged relative to the folder, or used independently.

The trimming member 18 is carried by the arm 24 of a rocking member and the other arm 25 projects upwardly from the fulcrum stud 20 for said trimming member. This rocking member receives oscillations from a shaft 26, which is mounted in a bracket 27, carried by the head of the machine, and a bracket 28 carried by the standard 2. At the forward end of the shaft 26 is fixed an upwardly projecting arm 29. A link 30 connects the arm 29 with the arm 25. The oscillations of the shaft 26 through the link 30 will, therefore, oscillate the trimming member 18.

Freely mounted on the shaft 26 is a rocking frame 31. This fram is formed with a downwardly projecting arm 32, which is connected to an eccentric strap co6perating with an eccentric on the main shaft. Said rocking frame 31 has a forwardly projecting arm 33. Fixed on the shaft 26 is a collar 34, having a forwardly projecting arm 35. The arms 33 and 35 are adapted to be locked together by a stud 36 controlled by a handle 37,. These parts are more fully shown and described in my co-pending application above referred to. When the arms 33 and 35 ar locked together, the rocking movements of the frame 31 will be imparted to the shaft 26, and through the link 30 to the trimming member 18.

A spring 38 surrounding the shaft 26 and engaging a sleeve fixed thereon normally presses the shaft 26 endwise toward the head of the machine. A collar 39 limits the endwise movement. The arm 40, fixed on the end of the shaft 26, coiiperates. with a fixed lug 11, when th arms 35 and 33 are separated to hold the trimmer in raised or inoperative position.

The pivotal connection 42 between the arm 25 and the link 30 is slightly below a hori zontal line passing through the pivotal point 13, where the link 30 is connected to the arm 29, when the presser foot is lowered on the material for stitching. The line 00-00 on Fig. 2 indicates the line of the pivotal points at this time. When the presser foot is raised from the material, the pivotal point 12 is slightly above said horizontal line and the line g g on Fig. 2 indicates the line of the pivotal point at this time. It will be apparent therefore, when the machine is at rest and the presser foot is raised to insert or remove the material, little or no movement will be imparted to the movabl trimming member through this bodily upward movement of the trimming members with the presser foot.

It is obvious that minor changes in the details of construction and the arrangement of parts may be made without departing from the spirit of the invention, as set forth in the appended claims.

Having thus described my invention, what I claim is:

1. A trimming mechanism for sewing machines including in combination, a work sup.- port, a presser foot having a shank with a recess therein, a stud secured to the presser foot and projecting centrally from said recess, an arm pivotally supported by said stud and projecting forwardly therefrom, a trimming member carried by said arm, a stationary trimming member mounted on said presser foot with which said firstnamed trimming member cotiperates, a spring located in said recess on said stud and operating on the arm to hold the trimming members in contact, a second arm rigid with the first-named arm and projecting upwardly therefrom, and means for oscillating said second arm.

2. A trimming mechanism for sewing machines including in combination, a work support, a presser foot having a shank with a recess therein, a stud secured to the presser foot and projecting centrally from said recess, an arm pivotally supported by said stud and projecting forwardly therefrom, a trimming member carried by said arm, a stationary trimming member mounted on said presser foot with which said first-named trimming member cooperates, a spring located in said recess on said stud and operating on the arm to hold the trimming members in contact, a second arm rigid with the first-named arm and projecting upwardly therefrom, an operating shaft, a link con- In testimony whereof, I aflix my signature neoting said operating shaft With said upin the presence of two Witnesses. wardly projecting arm, said link being substantially horizontal whereby the raising LANSING ONDERDONK' and lowering of the presser foot does not Witnesses:

affect the cutting position of the trimming R. A. OSWALD,

mechanism. J. H. HOWELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

